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- Page 3 of 8 - 

 

 

 

Report No.  65681 

 

 

 

 

 

Comp. 
No. 

Fault Test 

V Short 

current 

Test 
time 

Fuse No Current 

through 
fuse (A)

Mains power/temperatures/results 

C119 

S - c 

253 

- 

15min 

F907 

2,46 

FL display off immediately. 
Input current stabilised at 2,25A. 
R101 opened. 
D101, D102, Q104 damaged. 
No hazard. 

C117 

S - c 

253 

- 

20min 

F907 

2,25 

Normal operated. 
Input current stabilised at 2,25A. 
No component damaged.  
No hazard. 

C951 

S - c 

253 

- 

10min 

F907 

2,24 

Normal operated. 
Input current stabilised at 2,24A. 
R950 opened. 
No hazard. 

Q803 

S - c 

253 

C - E 

10min 

F907 
F905 
F906 

- 

Unit shut down immediately. 
Input current stabilised at 0,02A. 
F905, F906 opened. 
Q804 damaged. 
No hazard. 

Q803 

S - c 

253 

C - B 

10min 

F907 
F905 
F906 

3,04 

Unit shut down immediately. 
Input current stabilised at 0,02A. 
No component damaged. 
No hazard. 

C607 

S - c 

253 

- 

30min 

F907 
F905 
F906 

2,64 

Surr. L ch. output voltage dropped 
to 2,3V ac immediately. 
Input current stabilised at 2,07A. 
R821 opened. 
No hazard. 

Q804 

S - c 

253 

C - E 

10min 

F907 
F905 
F906 

8,21 

Unit shut down immediately. 
Input current stabilised at 0,02A. 
F905, F906 opened.  
Q803 damaged. 
No hazard. 

Q804 

S - c 

253 

C - B 

10min 

F907 
F905 
F906 

2,94 

Unit shut down immediately. 
Input current stabilised at 0,02A. 
No component damaged. 
No hazard 

C813 

S - c 

253 

- 

10min 

F907 
F905 
F906 

2,20 

Surr. L ch output off immediately. 
Input current stabilised at 1,99A. 
No component damaged. 
No hazard.  

F No = Fault Number, S-c = Short-circuit, Dis = Disconnection

 

 

 

- Page 4 of 8 - 

 

 

 

Report No.  65681 

 

 

 

 

 

Comp. 
No. 

Fault Test 

V Short 

current 

Test 
time 

Fuse No Current 

through 
fuse (A)

Mains power/temperatures/results 

Q659 

S - c 

253 

C - E 

10min 

F907 
F903 
F904 

- 

Unit shut down immediately. 
Input current stabilised at 0,02A. 
R658, F903, F904 opened. 
Q653 damaged. 
No hazard. 
(Repeated test three times with the 
same result) 

Q659 

S - c 

253 

C - B 

10min 

F907 
F903 
F904 

2,98 

Unit shut down immediately. 
Input current stabilised at 0,02A. 
No component damaged. 
No hazard. 

C633 

S - c 

253 

- 

10min 

F907 
F903 
F904 

2,59 

Front L ch. output voltage dropped 
to 2,4V ac immediately. 
Input current stabilised at 2,06A. 
R633 opened. 
No hazard. 

Q653 

S - c 

253 

C - E 

10min 

F907 
F903 
F904 

- 

Unit shut down immediately. 
Input current stabilised at 0,02A. 
F903, F904 opened. 
Q659 damaged. 
No hazard. 
(Repeated test three times with the 
same result) 

Q653 

S - c 

253 

C - B 

10min 

F907 
F903 
F904 

2,45 

Unit shut down immediately. 
Input current stabilised at 0,02A. 
No component damaged. 
No hazard. 

C568 

S - c 

253 

- 

15min 

F907 
F903 
F904 

2,10 

Front L ch output off immediately. 
Input current stabilised at 2,02A. 
No component damaged. 
No hazard. 

C902 

S - c 

253 

- 

10min 

F907 
F905 
F906 

6,40 

Surround and Center output off 
immediately. 
Input current stabilised at 1,49A. 
F905, F906 opened. 
No hazard. 

C902 

S - c 

207 

- 

10min 

F907 
F905 
F906 

6,10 

Surround and Center output off 
immediately. 
Input current stabilised at 1,40A. 
F905, F906 opened. 
No hazard. 

F No = Fault Number, S-c = Short-circuit, Dis = Disconnection 

 

 

- Page 5 of 8 - 

 

 

 

Report No.  65681 

 

 

 

 

 

Comp. 
No. 

Fault Test 

V Short 

current 

Test 
time 

Fuse No Current 

through 
fuse (A)

Mains power/temperatures/results 

C915 

S - c 

253 

- 

10min 

F907 
F903 
F904 

3,90 

Front and S/B Multi output off  
immediately. 
Input current stabilised at 1,17A. 
F903, F904 opened. 
No hazard. 
(Repeated test three times with the 
same result) 

C915 

S - c 

207 

- 

10min 

F907 
F903 
F904 

- 

Front and S/B Multi output off  
immediately. 
Input current stabilised at 1,10A. 
F903, F904 opened. 
No hazard. 
(Repeated test three times with the 
same result) 

IC94 

S - c 

253 

Pin 1 - 2  10min 

F907 

2,23 

Normal operated. 
Input current stabilised at 2,23A. 
R950, R948 opened. 
No hazard. 

IC94 

S - c 

253 

Pin 1 - 3  10min 

F907 

2,31 

Normal operated. 
Input current stabilised at 2,31A. 
No component damaged. 
No hazard. 

D962 

S - c 

253 

- 

7min 
24sec 

F907 

2,30 

Sub transformer primary winding he
ated up to 103.8K and thermal fuse 
open after 7min 24sec. 
Dielectric strength test ok. 
No hazard. 

C906 

S - c 

253 

- 

5min 
8sec 

F907 

0,08 

Unit shut down immediately. 
Sub transformer primary winding 
heated up to 101.9K and thermal fu
se open after 5min 8sec. 
Dielectric strength test ok. 
No hazard. 

C911 

S - c 

253 

- 

7min 
6sec 

F907 

0,08 

Unit shut down immediately. 
Sub transformer primary winding he
ated up to 102,8K and thermal fuse 
open after 7min 6sec. 
Dielectric strength test ok. 
No hazard. 

F No = Fault Number, S-c = Short-circuit, Dis = Disconnection 

 

 

 

- Page 6 of 8 - 

 

 

 

Report No.  65681 

 

 

 

 

 

Comp. 
No. 

Fault Test 

V Short 

current 

Test 
time 

Fuse No Current 

through 
fuse (A)

Mains power/temperatures/results 

C907 

S - c 

253 

- 

19min 
50sec 

F907 

0,05 

Unit shut down immediately. 
Sub transformer primary winding he
ated up to 101,3K and thermal fuse 
open after 19min 50sec. 
Dielectric strength test ok. 
No hazard. 

FAN 
(built-in 
rear 
panel) 

Locked 253 

- 

3hr 

F907 

2,24 

Normal 

operated. 

The components are heated up to :
-Main transf. pr. Winging  :82,4K 
-Main transformer core 

:68,1K 

-Sub transf. pr. Winging  :61,0K 
-Sub transformer core 

:57,9K 

-PWB near Q803 

:60,0K 

-PWB near D991 

:88,3K 

and stabilised. 
Dielectric strength test ok. 
No hazard. 

FAN 
(built-in 
main 

heat-sink

)

 

Locked 253 

- 

2hr 
45min 

F907 2,24 Normal 

operated. 

The components are heated up to :
-Main transf. pr. Winging  :72,6K 
-Main transformer core 

:48,1K 

-Sub transf. pr. Winging  :46,0K 
-Sub transformer core 

:39,6K 

-PWB near Q803 

:53,3K 

-PWB near D991 

:66,5K 

and stabilised. 
Dielectric strength test ok. 
No hazard. 

Top 
cover 
opening 

Block 253  - 

18min 
55sec 

F907 

2,24 

Unit shut down after 18min 55sec. 
Input current stabilised 0,02A. 
No component damaged. 
No hazard. 

Speaker 
terminal 

S – c 

253 

- 

10min 

F907 

- 

Unit shut down immediately. 
Input current stabilised 0,02A. 
No component damaged. 
No hazard. 

Pmax 
operating 

Maximun
 non-
clipped o
utput sig
nal 

253 - 

1hr 
40min 

F907 

4,97 

Front and S/B Mult output signal off
after 18min. 
Rear and Center output signal off 
after 1hr 25min. 
Input current stabilised at 0,31A. 
F903, F904, F905, F906 opened. 
No hazard. 

F No = Fault Number, S-c = Short-circuit, Dis = Disconnection